I've been a Mac guy since System 6 so this isn't me throwing rocks, but this still ends up being; "Wow, that's really fast for a Mac!".
The Xeon 28c gets roasted by Threadrippers and the Radeon Pro W6900X MPX still lags behind the GTX 3080/90's. Half the power at twice the price will be a difficult sell to woo back old users. Current M model Apple chips lack support for non integrated graphics, so I'm guessing a solution for a new Mac Pro is a ways out? They took so long bringing the last one to market, they ended up with a $20k solution that fails to answer a $10k question.
Though if someone gave me one...I wouldn't kick it off my desk!